Other
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe..26m&link_type=abstract
X-ray Binaries in the Chandra and XMM-Newton Era (with an emphasis on Targets of Opportunity), Abstracts of the conference held
Other
Actively Accreting And Transient Binaries
Scientific paper
Our observations of Cygnus X-1 with Chandra and XTE J1650-500 with XMM-Newton have revealed broad, skewed Fe K-alpha emission lines like those seen in some AGN. These lines are likely produced at the inner accretion disk, and may be used to constrain the inner radial extent of the disk and thereby black hole spin. In the case of XTE J1650-500, near-maximal spin may be required. Simultaneous observations with RXTE are critical for understanding the underlying spectrum, and for constraining the accretion flow geometry through reflection models. Moreover, the detection of high-frequency QPOs in simultaneous RXTE observations can provide a second spin constraint. We will present the results of our work, and discuss our findings in the context of other recent reports of broad Fe K lines and evidence for black hole spin. Finally, we will comment on the prospects for revealing black hole spin and accretion flow geometries with future observations.
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